Crossword Genius

Subj. of a Zener card experiment (3)

Ross

I believe the answer is:

esp

(Other definitions for esp that I've seen before include "Apparent power to perceive things that others can't, initially" , "Second sight (abbr)" , "Apparent power to perceive things that others can't, in short" , "Extrasensory perception (abbrev.)" , "Initially, clairvoyance or telepathy" .)

I've seen this clue in The New York Times.
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